National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

99°F

37°C

Humidity 33%
Wind Speed SE 12 mph
Barometer 29.91 in (1011.9 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Heat Index102°F (39°C)
Last update 31 Aug 5:56 pm CDT
Extended Forecast for

Lockhart TX

  • Tonight

    Tonight: Mostly clear, with a low around 76. East southeast wind 5 to 10 mph becoming light and variable after midnight.

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny and hot, with a high near 99. Heat index values as high as 104. Calm wind becoming east around 5 mph.

    High: 99 °F

    Hot

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 76. East wind around 5 mph becoming south after midnight.

    Low: 76 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, then gradually becoming sunny and hot, with a high near 100. Heat index values as high as 105. South southwest wind around 5 mph.

    High: 100 °F

    Hot

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 76. South wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 76 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny and hot, with a high near 100. South wind around 5 mph.

    High: 100 °F

    Hot

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 75. South wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 75 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny and hot, with a high near 100. South southeast wind around 5 mph.

    High: 100 °F

    Hot

  • Friday Night

    Friday Night: Mostly clear, with a low around 75. Southeast wind 5 to 10 mph becoming light south after midnight.

    Low: 75 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 76. East southeast wind 5 to 10 mph becoming light and variable after midnight.
Tuesday
Mostly sunny and hot, with a high near 99. Heat index values as high as 104. Calm wind becoming east around 5 mph.
Tuesday Night
Partly cloudy, with a low around 76. East wind around 5 mph becoming south after midnight.
Wednesday
Mostly cloudy, then gradually becoming sunny and hot, with a high near 100. Heat index values as high as 105. South southwest wind around 5 mph.
Wednesday Night
Partly cloudy, with a low around 76. South wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday
Mostly sunny and hot, with a high near 100. South wind around 5 mph.
Thursday Night
Partly cloudy, with a low around 75. South wind 5 to 10 mph, with gusts as high as 20 mph.
Friday
Mostly sunny and hot, with a high near 100. South southeast wind around 5 mph.
Friday Night
Mostly clear, with a low around 75. Southeast wind 5 to 10 mph becoming light south after midnight.
Saturday
Mostly sunny and hot, with a high near 100.
Saturday Night
Mostly clear, with a low around 75.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 99.
Sunday Night
Partly cloudy, with a low around 75.
Labor Day
Mostly sunny and hot, with a high near 100.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Lockhart TX
 29.88°N 97.68°W (Elev. 525 ft)
Last Update:
5:46 pm CDT Aug 31, 2026
Forecast Valid:
6pm CDT Aug 31, 2026-6pm CDT Sep 7, 2026
 
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Additional Resources

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Chance of Precipitation